package cn.tanjiajun.sdk.common.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,由该类来接管程序,并记录发送错误报告. Application中注册：
 * CrashHandler crashHandler = CrashHandler.getInstance();
 * crashHandler.init(this);
 *
 * @author TanJiaJun
 * @version 0.0.1
 */
public class CrashHandler implements UncaughtExceptionHandler {

    private static final String TAG = "CrashHandler";
    private static final int NO_OVERDUE_LOG_COUNT = 30;

    private UncaughtExceptionHandler mDefaultHandler;// 系统默认的UncaughtException处理类

    private static CrashHandler INSTANCE = new CrashHandler();// CrashHandler实例

    private Context mContext;// 程序的Context对象
    private Map<String, String> info = new HashMap<String, String>();// 用来存储设备信息和异常信息
    private SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss", Locale.CHINA);// 用于格式化日期,作为日志文件名的一部分
    private String defaultSaveFolderName = "Allintask";

    /**
     * 保证只有一个CrashHandler实例
     */
    private CrashHandler() {

    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
     */
    public void init(Context context) {
        mContext = context;
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();// 获取系统默认的UncaughtException处理器
        Thread.setDefaultUncaughtExceptionHandler(this);// 设置该CrashHandler为程序的默认处理器
    }

    /**
     * 当UncaughtException发生时会转入该重写的方法来处理
     */
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            // 如果自定义的没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(3000);// 如果处理了，让程序继续运行3秒再退出，保证文件保存并上传到服务器
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

//            MobclickAgent.onKillProcess(mContext);

            // 退出程序
//            ActivityHelper.getInstance().closeAll();
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @param ex 异常信息 true 如果处理了该异常信息;否则返回false.
     */
    public boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }

        new Thread() {
            public void run() {
                Looper.prepare();
                Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出", Toast.LENGTH_SHORT).show();
                Looper.loop();
            }
        }.start();

        // 收集设备参数信息
        collectDeviceInfo(mContext);

        deleteOverdueLogFiles();
        // 保存日志文件
        saveCrashInfo2File(ex);
        return true;
    }

    /**
     * 收集设备参数信息
     *
     * @param context
     */
    public void collectDeviceInfo(Context context) {
        try {
            PackageManager pm = context.getPackageManager();// 获得包管理器
            PackageInfo pi = pm.getPackageInfo(context.getPackageName(), PackageManager.GET_ACTIVITIES);// 得到该应用的信息，即主Activity
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                info.put("versionName", versionName);
                info.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            e.printStackTrace();
        }

        Field[] fields = Build.class.getDeclaredFields();// 反射机制
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                info.put(field.getName(), field.get("").toString());
//                Loger.d(TAG, field.getName() + ":" + field.get(""));
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
    }

    private String saveCrashInfo2File(Throwable ex) {
        ex.printStackTrace();
        StringBuffer stringBuffer = new StringBuffer();

        for (Map.Entry<String, String> entry : info.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            stringBuffer.append(key + "=" + value + "\r\n");
        }

        Writer writer = new StringWriter();
        PrintWriter pw = new PrintWriter(writer);
        ex.printStackTrace(pw);
        Throwable cause = ex.getCause();

        // 循环着把所有的异常信息写入writer中
        while (cause != null) {
            cause.printStackTrace(pw);
            cause = cause.getCause();
        }

        pw.close();// 记得关闭
        String result = writer.toString();
        stringBuffer.append(result);

        // 保存文件
        long timetamp = System.currentTimeMillis();
        String time = format.format(new Date());
        String fileName = "crash-" + time + "-" + timetamp + ".txt";

        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            try {
                File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + defaultSaveFolderName);
                Log.i("CrashHandler", dir.toString());

                if (!dir.exists()) {
                    dir.mkdir();
                }

                FileOutputStream fos = new FileOutputStream(new File(dir, fileName));
                fos.write(stringBuffer.toString().getBytes());
                fos.close();
                return fileName;
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    /**
     * 清除过多的Crash Log文件
     */
    private void deleteOverdueLogFiles() {
        File logFilesDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + defaultSaveFolderName);
        File[] logFiles = null;

        if (null != logFilesDir && logFilesDir.isDirectory()) {
            logFiles = logFilesDir.listFiles();
        }

        if (null != logFiles && logFiles.length > NO_OVERDUE_LOG_COUNT + 20) { //超过50个删除剩30个，下次超过50个继续删除
            Arrays.sort(logFiles, new CompratorByLastModified());

            for (int i = 0; i < logFiles.length - NO_OVERDUE_LOG_COUNT; i++) {
                File tempFile = logFiles[i];

                if (tempFile.exists()) {
                    tempFile.delete();
                }
            }
        }
    }

    class CompratorByLastModified implements Comparator<File> {

        public int compare(File f1, File f2) {
            long diff = f1.lastModified() - f2.lastModified();
            if (diff > 0) {
                return 1;
            } else if (diff == 0) {
                return 0;
            } else {
                return -1;
            }
        }

        public boolean equals(Object obj) {
            return true;
        }

    }

}
